Exhaust gas turbocharger
An exhaust gas turbocharger (1) having a compressor (2), a turbine (3) which has a turbine casing (4) in which a wastegate opening (5) is arranged and which has a charge pressure control flap arrangement (6) with a flap plate (7) which can be moved between a closed position and an open position. The flap plate (7) is provided with a guide lever (8) whose first end (9) is connected to a rear side (10) of the flap plate (7) and whose second free end (11) is guided in a curved track (12).
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The invention relates to an exhaust gas turbocharger according to the preamble of claim 1.
Such an exhaust gas turbocharger is known from DE 10 2008 011 416 A1. This exhaust gas turbocharger has a charge pressure control flap arrangement, wherein in such arrangements there is a conflict of aims between the required diameter for the flap bore, the resulting forces/torques, the possible adjustment of an actuator of the control flap arrangement, and the flow resistance of the system.
In particular in systems such as are known from the above-mentioned DE 10 2008 011 416 A1, which reduce the necessary actuator forces by means of what is referred to as a resolution of forces, there is considerably enlarged relative movement between the flap plate and the flap seat.
Together with degrees of play, tolerances and thermal expansions, this can lead to the flap plate becoming jammed in the flap bore, to increased wear or even to failure.
The aim of the present invention is therefore to provide an exhaust gas turbocharger of the type indicated in the preamble of claim 1, which reduces the previously explained disadvantages or entirely eliminates them.
The means of achieving this aim are provided by the features of claim 1.
As a result it is ensured that despite a reduction in the effective lever arm at the flap lever, a drastic reduction in the required force expenditure at the actuator is obtained, wherein at the same time the disadvantages of the prior art of the generic type are overcome since the flap plate is provided with a guide lever or additional joint which is guided in a curved track or cam track. This curved track or cam track (and therefore the flap arrangement) can either be integrated in a turbine casing of an exhaust gas turbocharger or in an exhaust manifold. In addition it is possible for the curved track to be arranged in a separate insert which can be connected to the turbine casing or the exhaust manifold.
In the case of the separate insert, the flap seat (sealing face) can be integrated into the turbine casing or the exhaust manifold or can be part of the separate insert. The separate insert may, for example, be screwed into the turbine casing or the exhaust manifold.
This results in the following advantages:
-
- The flap plate moves parallel to the flap seat over large distances and therefore cannot become jammed and therefore cannot damage the flap seat either.
- By means of a special guiding geometry it is possible for the flap plate to be pivoted completely out of the flow of the exhaust gas. This considerably reduces the flow losses.
- At the same time, only a short actuator path is required owing to the guiding geometry.
- In addition, an improved controllability is brought about, and in the fully opened state the flap plate can bear against the lever of the control flap arrangement, providing the advantage that there is no longer any solid-borne sound, and therefore no noise, anymore.
The dependent claims contain advantageous developments of the invention.
Further details, features and advantages of the invention can be found in the following description of exemplary embodiments with reference to the drawing, in which:
A preferred embodiment of an exhaust gas turbocharger 1 with a charge pressure control flap arrangement 6 according to the invention will be described below.
The turbocharger 1 illustrated in
The charge pressure control flap arrangement 6 has, as is apparent from
As is apparent from a combination of
As is also apparent from
As is illustrated in
In the course of the further opening movement illustrated in
By means of the charge pressure control flap arrangement 6 according to the invention it is possible, by virtue of the lever arm of the pivot lever which is significantly reduced, compared to the prior art, to achieve a minimized relative movement of the flap plate 7 and a considerably reduced force requirement as well as relatively small activation travel at the actuator A. In addition, the flap plate 7 can be effectively prevented from becoming jammed during operation, which contributes to significantly reduced wear and to significantly better operational reliability.
The control flap arrangement 6 is therefore arranged in a region of the exhaust manifold 19 which is connected to the turbine casing 4, and the wastegate opening 5 is part of the exhaust manifold 19.
In order to arrange the guide track 12, the installation part and/or the cover 22 is screwed to the exhaust manifold 19, wherein the cover 22 is dimensioned with its insert part 23 in such a way that after the cover 22 is secured to the exhaust manifold 19, the guide track 12 is arranged at a suitable location in the exhaust manifold 19 which makes it possible to insert the free end 11 into the guide track 12, as is apparent in particular from the figurative illustration in
In order to supplement the disclosure of the invention, reference is explicitly made here to the figurative illustration thereof in
- 1 Exhaust gas turbocharger
- 2 Compressor
- 3 Turbine
- 4 Turbine casing
- 5 Wastegate opening
- 6 Charge pressure control flap arrangement
- 7 Flap plate
- 8 Guide lever
- 8A, 8B, 8C Lever sections
- 9 First end
- 10 Rear side
- 11 Second free end
- 12 Curved track
- 12A, 12B, 12C Track sections
- 13 Pivot lever
- 13A, 13B First, second lever arm
- 14 Activation shaft
- 15 Sliding bushing
- 16 Ball joint
- 17 Fork receptacle
- 18 Insert/installation part
- 19 Exhaust manifold
- 20 Actuator
- 21 Actuating rod
- 22 Cover/installation part
- 23 Insert part
- α, β Angle
- E Plane
- L Longitudinal axis
- H Resulting lever arm
Claims
1. An exhaust gas turbocharger (1) comprising
- a compressor (2), and
- a turbine (3), which has a turbine casing (4), and which has a charge pressure control flap arrangement (6) with a flap plate (7) which can be moved between a closed position on a wastegate opening (5) and an open position via an activation shaft (14),
- wherein the flap plate (7) is provided with a guide lever (8) separate from the activation shaft (14), the guide lever (8) having a first end and a second end, wherein the guide lever (8) first end (9) is connected to a rear side (10) of the flap plate (7) and the guide lever (8) second end (11) is guided in a curved track (12).
2. The exhaust gas turbocharger as claimed in claim 1, wherein the flap plate (7) is connected to a bent pivot lever (13) which is operatively connected to the activation shaft (14) of an actuator of the control flap arrangement (6).
3. The exhaust gas turbocharger as claimed in claim 1 wherein the guide lever (8) has a lever section (8A) which extends linearly from the guide lever (8) second free end (11), at least approximately in parallel with a longitudinal axis (L) of the activation shaft (14).
4. The exhaust gas turbocharger as claimed in claim 1, wherein the guide lever (8) second end (11) is provided with a sliding bushing or a roller body (15).
5. The exhaust gas turbocharger as claimed in claim 1, wherein the guide lever (8) first end (9) is provided with a ball joint or a pin joint (16).
6. The exhaust gas turbocharger as claimed in claim 1, wherein the charge pressure control flap arrangement (6) is embodied as a separate insert (18).
7. An exhaust gas turbocharger (1) comprising
- a compressor (2), and
- a turbine (3), which has a turbine casing (4), and which has a charge pressure control flap arrangement (6) with a flap plate (7) which can be moved between a closed position on a wastegate opening (5) and an open position,
- wherein the flap plate (7) is provided with a guide lever (8) having a first end and a second end, wherein the guide lever (8) first end (9) is connected to a rear side (10) of the flap plate (7) and the guide lever (8) second end (11) is guided in a curved track (12), wherein the curved track (12) is integrated into the turbine casing (4).
8. An exhaust gas turbocharger (1) comprising
- a compressor (2), and
- a turbine (3), which has a turbine casing (4), and which has a charge pressure control flap arrangement (6) with a flap plate (7) which can be moved between a closed position on a wastegate opening (5) and an open position,
- wherein the flap plate (7) is provided with a guide lever (8) having a first end and a second end, wherein the guide lever (8) first end (9) is connected to a rear side (10) of the flap plate (7) and the guide lever (8) second end (11) is guided in a curved track (12), wherein the curved track (12) is integrated into an exhaust manifold (19).
20110023481 | February 3, 2011 | Baeuerle |
20110110767 | May 12, 2011 | Castan |
Type: Grant
Filed: Jun 20, 2012
Date of Patent: Feb 7, 2017
Patent Publication Number: 20140119896
Assignee: BorgWarner Inc. (Auburn Hills, MI)
Inventor: Silvio Koch (Kirchheimbolanden)
Primary Examiner: Gregory Anderson
Assistant Examiner: Michael Sehn
Application Number: 14/123,997
International Classification: F02B 37/18 (20060101); F02B 37/22 (20060101); F01D 17/10 (20060101); F01D 17/20 (20060101); F02C 6/12 (20060101);